Astronomers have just discovered a new celestial body in our solar system that could challenge major space theory. 2017 OF201 ...

Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System - a ...

Our solar system’s origin story spans billions of years and involves clouds of gas, cosmic collisions, and planetary ...

SpaceX's Starship rocket roared into space but then spun out of control about halfway through its flight, failing to complete ...

Cheng, together with graduate students from Princeton University, discovered the potential dwarf planet while searching for ...